Die for making bolts



(No-Model.) v I A. POND & R. T. FROST.

Die for Making Bolts.

No. 240,181. Patented Apri l 12,1881.

.PETERS. PNOY0-L|TMOGRAPHER, WASHINGTON. o. C.

UNITED STATES PATENT Fries.

ALVIN POND AND REUBEN T. FROST, OF MARION, CONNECTICUT.

, DIE FOR MAKING BOLTS. n

SPECIFICATION formingpart of Letters Patent No. 240,181, dated April 12, 1881.

Application filed February 19, 1881.. (No model.)

To all whom it may concern:

'- Be it known that We, ALVIN POND and REU- Hartford and State of Connecticut, have invented new Improvements in Dies for Making Bolts; and we do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in-

Figure 1, a sectional view of the upper die; gig. 2, a perspective View of one-half the lower This invention relates to an improvement in heading-dies for making that class of bolts commonly called carriage-bolts, and such as have the neck of the bolt made angular or square, and now known as the Clark bolt, and such as heretofore made in the dies patented to Wm. J. Clark, No. 43,669, antedated February 2, 1864. Inthese dies the part in which the angular neck is formed has an area substantially equal to the transverse area of the rod from which the bolt is to be made and of the cylindrical part of the cavity of the dies, so that when the round blank is placed between the cavities in the two parts of the die, and the two parts forced together, the angular portion thereof will press at four opposite points on the blank and compress it into angular shape, forcing the metal into the angles, so as to form the square portion without necessarily forcing additional metal onto the said angular part, and then, While the blank is held between the parts of the die which have shaped the neck, the head is formed, the parts of the die which hold the blank serving as the anvil on which to make the head.

A serious difliculty has been experienced in making this class of bolts, from the fact that in compressing the metal to form the neck, which must be done before the heading can take place, the metal is more or less chilled; and in the subsequent upsetting of the metal above the neck, which forms thehead, what is commonly known as a cold-shut, is frequently produced between the neck and the head, thus weakening the bolt, and frequently causing the head to break from the neck.

To overcome this difficulty is the object of this invention, which consists in the .diesconstructed as hereinafter described, and particularly recited in the claim.

A represents one half the die, in which blanks are held and the neck shaped, the other half being a duplicate thereof. In this die are two cavities, a b--the one, a, for the primary operation, and the second, b, for finishing the bolt, the lower part, c, of the cavity (1 correspond ing to the cylindrical blank. The part dis angular, preferably so as to form four angles,

the transverse area of this portion 01 being substantially that of the cylindrical section of the part 0. At the face end of the cavity athe die has a countersunkportion, e, which is circular in transverse section, expanding from the part d outward.

The blank, Fig. 3, is placed between the two parts of the die in the cavity a, its end protruding, as seen in broken lines, Fig. 1, to a sufiicient extent to give metal above the part d of the cavity to form a complete head. The two parts of the die a are then forced together, compressing that portion of the blank in the part 01 until the two faces of the dies meet, thus giving to the portion in the part at an angular shape, as in the hercinbeibre-mentioned Clark bolt. Then the heading-die is forced toward the face of the holding-die. In this heading-die B is the cavity f, having the shape of a frustum of a cone, which receives the end of the blank and upsets the metal into the part c of the cavity, producing the shape seen in Fig. 4, and in which the enlarged portion gradually expands from the square or angular portion. Then the blank, thus prepared, is placed in the second cavity, 1), which is of substantially the shape used to make the Clark blankthat is to say, the part It corresponds to the cylindrical body of the bolt and the part 1 to the angular neck-so that when the blank (Fig. 4) is introduced into said cavity b it substantially fills the same, the enlarged portion standing above the face of the die, the blank resting at the intersection of the angular neck with the enlarged part designated by the letter a, Fig. 4. Then the heading-die, in which is a cavity, m, corresponding to the shape of the finished head, descends upon the projecting and enlarged end of the blank and upsets that portion upon the face of the holding-die and into the finished head.

Because the partial upsetting and expanding of the metal above the neck by the firstoperation leaves the surface inclined to the face of the (lie, the cold-shut produced by making the upset and breaking down to a right angle at the first operation is avoided.

We claim- The hercin-described dies for heading bolts, consisting of a die having a cavity, a, consisting of a cylindrical part, c, the angular part 01,

and the expanding part 0, and the second cavity, I), having the cylindrical part h 'and angular part *5, combined with a heading-die constructed with a cavity, f, and a finishing cavity, m, corresponding to the cavities a and b, respectively, substantially as described.

ALVIN POND.

REUBEN T. FROST.

Witnesses:

L. D. ROGERS, JOHN E. EARLE. 

